A guy in The Mustang Club here used to have one. It was a 427 4 spd. i think he dynoed it at over 400 at the rear wheels but im not sure it may have been even more
I got to rid in it after he dynoed it down the street and omg! This was before i had my stang and before i really knew much about cars but geez. I couldnt see the gauges but ill bet he got it past 100. he sold it for like 40k just recently.
Later,
Nick